Die for pressing leather loops



(No Model.) 2 sheets-sheen 1.

F. J. BRINGHAM. DIE POR PRESSING LEATHER Loops.

NO. 537,915.. v PatentedpI. 23, 1895.

Y J fa-f v (No Model.) 2 Sheets-Sheet.l 2.

F. J. BRINGHAM. DIE FOR PRESSING LEATHER LOOPS.

No. 537,915. Patented Apr. 23,1895.

"iharrnn TATES FRIENDJ. BRINGHAM, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE SEMLESSA LEATHER COMPANY, OF ILLINOIS.

DlE FOR PRESSING LEATHER LOOPS.

EECEFIUATION forming part of 4Letters Patent No. 5372915, dated April 28, 1 895.

Application filed January 9, 1895. Serial No. 534,400. (No model.)

To all whom t may concern.'

Be it known that I, FRIEND J. BRINGHAM, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois,have invented certain new and useful Improvements in Dies for Pressing Leather Loops, of which the following is a specication, reference being had therein tothe accompanying drawings.

My invention relates to dies for pressing and forming leather loops, of the kind shown in Letters Patent of the United States No. 500,111. These loops are formed of split leather with uncut edges, and they are formed by pressure and expansion into the proper shape and condition.

The-invention herein described consists of a special construction of die and combined with a mandrel, all as hereinafter explained, and as illustrated in the accompanying drawings, in which- Figure lis a central vertical section through the frame and die sections. Fig. 2 is a face view of the same. Fig. 3 is a side elevation of Fig. 2. Fig. 4 is a bottom plan of Fig. 2. Figs. 5 and 6 show detached views of the lower die. Fig. 7 is a section through the upper die.

Fig. 8 is a detail of one part of the upper die.

Fig. 9 is a detail of the supplemental die piece. Fig. l() is a view of a detail.

In the drawings A represents the block or frame in which the operating parts are mounted. This frame has two arms a, o., which leave an open space a between. the arms in which the die faces meet.

The principle of the invention consists essentially in movable die faces closing from opposite sides against the mandrel or against the outer surface of the loop on the mandrel combined with end pieces, one of which bears against the end of the mandrel, and one end of the loop, and the other of which surrounds the mandrel, and bears against the other end of the loop. v

The mandrel is shown at B, it being a substantially rectangular bar xed axially upon a stem l), which is fitted to slide accurately,

in a hole in the frame, and in line with the space between the die faces.

The die blocks are shown at C, D. For

convenience I call C the lower die block, and I) the upper. These blocks are formed `ou their ends with die faces. The die face of the lower block is shown at c. This is a plain face to each side of which are projections d, the inclined faces of which bound the die face on opposite sides. The upper die has a die cavity e, which has parallel sides fitted to close over the loop on the mandrel. The top of this die cavity has inwardly inclined sides terminating in a narrower cavity above, and in this cavityl is located a supplemental die piecef, the stem of which extends upwardly, and is loosely supported upon a pin. supplemental die is loose in its cavity, and the upper die block is made in two parts pivoted at g, so that the die parts have a slight opening and closing movement ou the supple-` mental die. The die parts are held normally apart by means of an inclosed spring 2.

The walls of the cavity c are inclined on the outside at d the inclinations corresponding to those shown at d in the lower die, so that when the lower die block is pressed up it crowds together the parts of the upper die block. The die faces being open from front to rear, and being arranged as shown in Fig. l, the mandrel enters and lies in the space extending from front to rear. Covering this open space in front and bearing against the front end of the mandrel are twoplates E, F, theupper plate F having an open space between two lateral .arms fitted to receive the plain lower plate E, between the arms. These plates slide in guide-ways in the arm of the frame, and are pressed normally toward each other by springs upon pins h, the springs bearing against projections on the die blocks, in which the pins are fitted. The inner faces of these plates form a rigid wall bearing against the outer end ofthe loop, which is shown at G in its place on the mandrel.

Upon the mandrel and bearing against the inner side of the dies, is a plate t', shown in detail in Fig. 10 which is fitted upon the mandrel movable but snugly. The outer faces of the plate -are beveled and against these beveled faces bear the correspondingly beveled faces of projections lc on the die blocks, sothat when the dies come together, they press The IOO

the plate against the inner end of the loop, and thus the loop is pressed on all its surfaces. In order to vthrow the die blocks apart after each action, I provide springs Z, which are in the path of the die blocks, these springs being compressed when the dies come together and operating to throw the dies apart as soon as they are released. The projections carrying the inclined faces 7c, are located on rear projections of the die blocks.

The faces of the die which bear against the loop may be formed with any kind of beaded or ornamental surface adapted to give suitable appearance or iinish to the loop.

The apparatus above described is adapted to be placed in a press or underahammer by means of which force is applied to the ont'er ends ot both die blocks, so as to force them inward against the loop on the mandrel, and in order that the blocks may be held against the loop to give continued pressure attertlie blow, I have provided locking devices, which are shown at m in place in Figs. l and 3. These consist of bolts which slide in guideways in the arms of the frame, being pressed normally forward by springs located on stems n. The forward ends of these bolts are beveled, and when they are thrown forward by the springs, wedgeinto corresponding notches o, in the die blocks, when the die blocks are brought together, the notches registering with the bolts when the blocks are in their most advanced position. The bolts are withdrawn by any suitable means through the stems n.

I claiml. The die for pressing loops consisting ot the die C, having the inclined projections, and the two part die D, havingasupplemental die, and the inclined projections el', and the mandrel arranged between the dies, substantially as described.

2. In combination, the die C and the two lpart die D, said dies having the inclined pro- In testimony whereof I affix my signature in presence of two Witnesses. Y

F'. J. BRINGHAM. Witnesses:

HENRY E. COOPER, JAMES M. SPEAK. 

